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Railways R.R.C. (Allahabad) Solved Paper 2nd Shift Held on 1-12-2013

  • question_answer
    Which one of the following types of waves are used in a night vision apparatus?

    A) X-rays              

    B) Infra-red waves

    C) Micro-waves                  

    D) Radio-waves

    Correct Answer: B

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